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SQL Joins exercises on soccer Database: Find the number of captains who was also the goalkeeper

SQL soccer Database: Joins Exercise-40 with Solution

40. From the following tables, write a SQL query to find the number of captains who was also the goalkeeper. Return number of captains.

Sample table: match_captain


Sample table: player_mast


Sample table: soccer_country


Sample Solution:

SQL Code:

SELECT count(DISTINCT player_name)
FROM match_captain a
JOIN soccer_country b ON a.team_id=b.country_id
JOIN player_mast c ON a.player_captain=c.player_id
AND posi_to_play='GK';

Sample Output:

 count
-------
     4
(1 row)

Relational Algebra Expression:

Relational Algebra Expression: Find the number of captains who was also the goalkeeper.

Relational Algebra Tree:

Relational Algebra Tree: Find the number of captains who was also the goalkeeper.

Practice Online


Sample Database: soccer

soccer database relationship structure

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: From the following tables, write a SQL query to find the captain who was also the goalkeeper. Return match number, country name, player name and jersey number.
Next: From the following tables, write a SQL query to find the players along with their team booked number of times in the tournament. Show the result according to the team and number of times booked in descending order. Return country name, player name, and team booked number of times.

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SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3